Nero Start Smart 6 MP3 tracks

I have Nero StartSmart 6. I am trying to create an mp3 disc and I want to burn the tracks in a specific order. I have so far not been able to do this. Can I do it and if so how?

I think the only way is probably to include a track no. as the first characters of the file name.
I use Roxio which does not seem to have this problem but the above might help.